Agilent Technologies E4406A VSA Series Service Manual page 256

Post-Repair Procedures
Baseband I/Q Amplitude Accuracy Test
5. Preset the signal source and initialize the test equipment
6. Perform the following steps for each test setup listed in
7. Press
8. Change the signal source frequency to 5 MHz.
9. Repeat step 6 and record the measured value in the UUT Measured
Table 5-8 Amplitude Accuracy at 100 kHz and 5 MHz
Input I/Q Input Z
Port
50 Ω Unbalanced
I only
50 Ω Unbalanced
I only
50 Ω Unbalanced
I only
256
parameters as shown in
Table 5-7
Parameter
Frequency
Level
Modulation
Input Input Port
a. Press ,
instrument.
Input I/Q Setup
b. Press ,
Input I/Q Range
c. Press ,
d. Connect the signal source to the specified I/Q input connector. For
balanced measurements (when the I/Q input Z is 600 ohms
balanced or 1 M ohm balanced) connect a 50 Ω BNC terminator to
the complementary input. The complementary input for I is I and
for Q is Q.
Marker Search
e. Press ,
f. Record the measured value in the UUT Measured Amplitude
column for 100 kHz in
g. Compare the measured and nominal values to ensure that the
measured value is within the 1dB test limit.
SPAN 5 MHz
, , then
Amplitude column for 5 MHz.
I/Q I/Q Input
Range Connector
(V)
1 I input
0.25 I input
0.125 I input
Table 5-7.
Signal Source Initialization
Setting
100 kHz
-16 dBm (100mVPP)
Off
to configure the input port of the
I/Q Input Z
, to configure input impedance.
to select the desired voltage range.
.
Table 5-8.
to change the span of the UUT.
UUT Measured
Amplitude
(dBm)
100 kHz 5 MHz
Table 5-8.
Nominal Test
Amplitude Limits
(dBm) (dB)
−16 ± 1.0
−16 ± 1.0
−16 ± 1.0
Chapter 5